docs: def cli(env, identifier):
      """Retrieve credentials used for generating an AWS signature. Max of 2."""
  
      mgr = SoftLayer.ObjectStorageManager(env.client)
      credential_list = mgr.list_credential(identifier)
      table = formatting.Table(['id', 'password', 'username', 'type_name'])
  
      for credential in credential_list:
          table.add_row([
              credential['id'],
              credential['password'],
              credential['username'],
              credential['type']['name']
          ])
  
      env.fout(table)